JPH08173356A - Vacuum cleaner - Google Patents

Abstract

PURPOSE: To provide a vacuum cleaner in which a suction opening body is prevented from being stuck to a surface to be cleaned, so that a burden on an electric-powered blower in a vacuum cleaner main body is reduced and a travelling performance of the suction opening is improved. CONSTITUTION: A negative pressure in an air duct is detected by a pressure detecting means, and a mutually opposing interval between a suction opening 14 and a surface Y to be cleaned is adjusted on the basis of the detection result of the pressure detecting means, thereby preventing a suction opening body from being stuck to the surface Y.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner, and more particularly to an electric vacuum cleaner having a suction port for simultaneously sucking dust and the like on a wide range of surfaces to be cleaned.

[0002]

2. Description of the Related Art Conventionally, a free end portion of a communication pipe connected in communication with a cleaner body containing an electric blower has a suction port body capable of simultaneously sucking dust and the like on a wide range of surfaces to be cleaned. An electric vacuum cleaner that is detachably attached is known.

The suction port body has a suction port formed on the bottom surface so as to face the surface to be cleaned at a predetermined interval, and is rotatably mounted so as to communicate with the suction port and connected to a communication pipe. And a connecting pipe body.

Further, from the bottom surface of the suction port body, there is projected a wheel which assists the movement of the suction port body while maintaining the facing distance between the suction port body and the surface to be cleaned.

This wheel is provided with two left and right portions in front of the suction port (hereinafter referred to as "front wheels") and two left and right portions in rear of the suction port (hereinafter referred to as "rear wheels"). Each is rotatably mounted via a shaft fixed to the main body.

[0006]

By the way, in the electric vacuum cleaner constructed as described above, the front wheels and the rear wheels of the suction port body maintain the facing distance between the suction port body and the surface to be cleaned. For example, when a relatively hard floor such as a tatami mat or flooring is the surface to be cleaned, when a relatively soft floor such as a carpet is the surface to be cleaned, or when the carpet is a carpet, etc. Sinking occurs in the suction port body, the suction port is blocked by the carpet, and the negative pressure inside the air passage from the suction port to the electric blower becomes high.

When the internal negative pressure increases, not only the load on the electric blower increases, but also the suction port sticks to the surface to be cleaned, and the suction port moves, that is, the front wheels and the rear wheels run. There was a problem that it adversely affected sex.

The present invention has been made in view of the above circumstances, and can prevent the suction port body from sticking to the surface to be cleaned. Therefore, the load on the electric blower in the main body of the vacuum cleaner is reduced. An object of the present invention is to provide an electric vacuum cleaner that can be reduced and can improve the running property of the suction port body.

[0009]

In order to achieve the object, the invention described in claim 1 is a cleaner main body accommodating an electric blower, and the cleaner main body is connected to the cleaner main body through a communication pipe and In an electric vacuum cleaner having a suction port body having a suction port formed on a bottom surface thereof so as to face a cleaning surface at a predetermined interval, an internal negative pressure of an air passage between the electric blower and the suction port. And a negative pressure control means for adjusting the facing distance between the suction port and the surface to be cleaned based on the detection result of the pressure detection means.

[0010]

In the above-mentioned structure according to claim 1,
The internal negative pressure in the air passage is detected by the pressure detection means, and the facing distance between the suction port and the surface to be cleaned is adjusted by the negative pressure control means based on the detection result of the pressure detection means, and the surface to be cleaned of the suction port body is adjusted. It is prevented from sticking to.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an electric vacuum cleaner of the present invention will be described with reference to FIGS.
A description will be given based on FIG.

(First Embodiment) FIGS. 1 to 3 show a first embodiment of an electric vacuum cleaner of the present invention, and FIG. 1 (A) is a description of the main part of the suction port body when the internal negative pressure is normal. FIG. 1 (B) is an explanatory view of the main part of the suction port body when the internal negative pressure is high, FIG. 2 is a plan view of the suction port body with the cover removed, and FIG. 3 is an external perspective view of the vacuum cleaner. .

In FIG. 3, an electric vacuum cleaner 1 includes a cleaner body 2, a bellows-shaped hose 3 having one end attached to a communication port 2a formed in front of the cleaner body 2, and the other end of the hose 3. The hand operation tube 4 connected to the hand operation tube 4, a plurality of extension tubes 5 and 5 connected to the hand operation tube 4, and a suction port body 6 detachably attached to the extension tube 5.

An electric blower 7 is provided inside the cleaner body 2.
And a dust collection case for storing dust or the like sucked through the extension pipes 5 and 5, the hand operation pipe 4, the hose 3 and the communication port 2a, which form a communication pipe with the suction port body 6 by the suction force of the electric blower 7. 8 and. Further, a swivel wheel (not shown) and a rear wheel 9 for assisting the movement of the cleaner body 2 are provided on the bottom surface of the cleaner body 2.

The suction port body 6 comprises a main body 11 which is long in the left-right direction when the movement direction is front and back, and a connecting pipe body 12 which is rotatably mounted on the main body 11 and connected to the extension pipe 5. ing.

The main body 11 includes a lower cover 13 and a lower cover 1.
3, an upper front cover 14 and an upper rear cover 15 are provided. In addition, inside the main body 11, as shown in FIG.
A rotary cleaning body 15 located above the suction port 14 formed in the lower cover 13, a motor 17 for rotating the rotary cleaning body 15 via a drive belt 16, and a power supply to an electric system (omitted) of the motor 16 and the like. A control circuit 18 which also serves as a supply circuit,
A pressure sensor 18 ', which is connected to the control circuit 18 and detects pressure (negative pressure) in the cleaning body storage chamber 15' in which the rotary cleaning body 15 is stored, and a negative sensor controlled by the control circuit 18. The pressure control means 19 is provided.

The lower cover 13 has front wheels 20 and 20 rotatably mounted via shafts 20a and 20a at two positions on the left and right in front of the suction port 14 and shafts at two positions on the left and right behind the suction port 14. The rear wheels 21 and 21 are rotatably mounted via the wheels 21a and 21a.

The negative pressure control means 19 is shown in FIGS. 1 (A) and 1 (B).
As shown in FIG. 3, the fixed solenoid 22 and the movable solenoid 23 are provided, and the free end of the movable solenoid 23 contacts the surface of the surface Y to be cleaned when the movable solenoid 23 is extended. (See FIG. 2B) Sliding member 2
It is equipped with 4.

In the above structure, the suction port 14 is opposed to the surface to be cleaned Y with a predetermined space, and in this state the front wheel 20
In addition, while the rear wheel 21 is rotated to move the suction port body 6, dust and the like are sucked by the suction force of the electric blower 7.

At this time, the negative pressure control means 19 detects the internal negative pressure in the vicinity of the suction port 14 and controls the facing distance between the suction port 14 and the surface Y to be cleaned based on the detection result.

For example, when a relatively hard floor surface such as a tatami mat or a flooring is the surface to be cleaned Y, the negative pressure does not exceed a predetermined value (in normal use).
Cleaning is performed in the state shown in (A).

That is, the line A shown in FIG. 1A becomes +, the line B becomes −, the line C becomes +, and the line D becomes −, and the SN poles of the solenoids 22 and 23 become different polarities due to this current. The solenoid 22 and 23 is brought into the approaching state due to the suction action.

On the other hand, when the relatively soft floor surface of the carpet or the like is the surface Y to be cleaned, the suction port 6 is sunk, and the suction port 14 is blocked by the carpet and the suction port is closed. When the body 6 sticks to the carpet, the internal negative pressure in the cleaning body storage chamber 15 'increases, so that cleaning is performed in the state shown in FIG. 1 (B).

That is, the line A shown in FIG. 1B is −, the line B is +, the line C is +, and the line D is −, and the SN poles of the solenoids 22 and 23 become the same pole due to this current. The movable side solenoid 23 expands due to the repulsion of the movable side solenoid 23, the sliding member 24 contacts the surface to be cleaned Y and lifts the rear wheel 21 due to this expansion, and the suction port body 6 as a whole has a front bottom rear high shape. It becomes the inclined state.

Therefore, the facing distance between the suction port 14 and the contacted surface Y is widened, so that the amount of air suctioned from the suction port 14 can be secured and the internal negative pressure can be lowered, resulting in Not only can the load on the electric blower 7 be reduced, but also the suction of the suction block 6 can be prevented, and the traveling properties of the front wheels 20 and the rear wheels 21 can be secured.

A sliding member 24 is provided on the rear side of the suction port 14.
Since the suction port 14 and the surface to be cleaned are not largely separated from each other in this inclined state, the suction port 14 is lifted to secure the flow velocity of the suction port 14, and thus the suction efficiency of the dust of the suction port body 6 is reduced. It is possible to maintain good running accuracy.

(Second Embodiment) By the way, the negative pressure control means 19 of the above embodiment is provided with a fixed side solenoid 22 and a movable side solenoid 23, and the movable side solenoid 2
Although the sliding member 24 is provided at the free end of No. 3, the rear wheels 31, 31 are connected by one shaft 31a and the negative pressure control means 29 is provided, for example, as shown in FIGS. Is composed of a fixed-side solenoid 32 and a movable-side solenoid 33, the shaft 31a is connected to the movable-side solenoid 33, and the movable-side solenoid 33 is extended, so that the rear wheels 31, 31 project from the bottom surface of the suction port body 6 by May be increased to widen the facing distance between the surface Y to be cleaned and the suction port 14. In FIGS. 4 and 5, the same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. Also, the basic conditions and actions are substantially the same.

According to this structure, the rear wheel 3
Since 1 and 31 are used as a part of the load control means, the configuration can be simplified.

Further, since the rear wheels 31, 31 project from the bottom surface of the main body and come into contact with the surface to be cleaned, the running performance becomes better.
Although the above-described embodiment discloses the configuration for detecting the negative pressure in the cleaning body storage chamber 15 ', if the suction of the suction port body 6 can be detected by the negative pressure, the communication pipes (extension pipes 5, 5 ,. Any configuration may be used as long as it detects the pressure on the air passage such as the pressure in the dust collection chamber of the hand operation pipe 4, the hose 3) or the cleaner body 2.

[0030]

As described above, in the electric vacuum cleaner of the present invention, the pressure detection means for detecting the internal negative pressure in the air passage between the electric blower and the suction port, and the detection by the pressure detection means. By including the negative pressure control means for adjusting the facing distance between the suction port and the surface to be cleaned based on the result, it is possible to prevent the suction port body from sticking to the surface to be cleaned, and thus, the electric The load on the electric blower in the cleaner body can be reduced, and the traveling performance of the suction port body can be improved.

[Brief description of drawings]

FIG. 1 shows a suction port body of a first embodiment of an electric vacuum cleaner according to the present invention, in which (A) is an explanatory view of a main part when an internal negative pressure is normal,
(B) is an explanatory view of a main part when the internal negative pressure is high.

FIG. 2 is likewise a plan view of the suction port body with the cover removed.

FIG. 3 is likewise an external perspective view of the electric vacuum cleaner.

FIG. 4 shows a suction port body of a second embodiment of the electric vacuum cleaner of the present invention, (A) is an explanatory view of a main part when the internal negative pressure is normal,
(B) is an explanatory view of a main part when the internal negative pressure is high.

FIG. 5 is a plan view of the suction port body with the cover removed.

[Explanation of symbols]

 1 ... Vacuum cleaner 2 ... Vacuum cleaner body 3 ... Hose (communication pipe) 4 ... Hand operation pipe (communication pipe) 5 ... Extension pipe (communication pipe) 6 ... Suction port body 7 ... Electric blower 14 ... Suction port 18 ... Control Circuit 18 '... Pressure detection means 19 ... Negative pressure control means

Claims (3)

[Claims] 1. A cleaner main body accommodating an electric blower, which is connected to the cleaner main body through a communication pipe, and has a suction port formed on the bottom surface so as to face the surface to be cleaned at a predetermined interval. In a vacuum cleaner having a suction port body, a pressure detection unit that detects an internal negative pressure of an air passage between the electric blower and the suction port, and the suction unit based on a detection result of the pressure detection unit. An electric vacuum cleaner comprising: a negative pressure control means for adjusting a facing distance between a mouth and a surface to be cleaned. 2. The negative pressure control means is located rearward of the suction port and protrudes from the bottom surface of the suction port body when the pressure detection means detects that the internal negative pressure is higher than a predetermined level. The electric vacuum cleaner according to claim 1, wherein the electric vacuum cleaner is a sliding member that abuts the surface to be cleaned so as to widen a facing distance between the surface to be cleaned and the suction port. 3. The negative pressure control means increases the amount of protrusion from the bottom surface of the suction port body when the pressure detection means detects that the internal negative pressure is higher than a predetermined level, and the surface to be cleaned and the cleaning surface. The electric vacuum cleaner according to claim 1, wherein the electric vacuum cleaner is a wheel that widens a facing distance from the suction port.